People do get emotional and say terrible things after terrorist attacks. I know I thought some pretty horrible things after Orlando, and expressed some of those thoughts in private conversations with friends. In situations like this, I think people deserve a chance to walk back anything they regret saying.
Thinking horrible things is excusable. Holding a short-term grudge is understandable. But some of us have a responsibility to wait for the evidence to come in before we make definitive, official statements or make contractual commitments.
We should all know that any statement of racial, ethnic, or religious bigotry is invariably suspect. To put it mildly, this anti-Islamic stuff sounded just as ugly in the original German when the pariahs were called
Juden.
Law-enforcement professionals know when to not say things that might help a suspect get away. Maybe they might leak something that might get the suspect to do something incriminating, like flight or destruction of evidence while under surveillance.
We do not need terror in the form of blanket acts of retribution. Terrorism using Islam as a pretext is no more Islam than terrorism using 'white identity' as a pretext is 'whiteness'. Wise people stop any cycle of violence with a refusal to do harm.